[sw, dif] add C/C++ guard to dif_warn_unused_result.h

This header is used included by other polyglot headers, and must
also be a polyglot header, as per
https://docs.opentitan.org/doc/rm/c_cpp_coding_style/, "Polyglot
headers":

"Moreover, all non-system #includes in a polyglot header must also be
of other polyglot headers. (In other words, all C system headers may
be assumed to be polyglot, even if they lack guards.)"

In practice this header is not likely to cause any issues, however, it
easier to add the guard than treat it as an exception.

Signed-off-by: Silvestrs Timofejevs <silvestrst@lowrisc.org>
1 file changed
tree: 226ebc264368de3ae93b8bf471ccc464f06e3a07
  1. .github/
  2. ci/
  3. doc/
  4. hw/
  5. site/
  6. sw/
  7. test/
  8. util/
  9. .clang-format
  10. .dockerignore
  11. .flake8
  12. .gitignore
  13. .style.yapf
  14. _index.md
  15. apt-requirements.txt
  16. azure-pipelines.yml
  17. check_tool_requirements.core
  18. CLA
  19. COMMITTERS
  20. CONTRIBUTING.md
  21. LICENSE
  22. meson.build
  23. meson_init.sh
  24. meson_options.txt
  25. python-requirements.txt
  26. README.md
  27. tool_requirements.py
  28. toolchain.txt
README.md

OpenTitan

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